From: Ralf Baechle <ralf@linux-mips.org>
To: Karl-Johan Karlsson <creideiki+linux-mips@ferretporn.se>
Cc: linux-mips@linux-mips.org
Subject: Re: /proc/cpuinfo makes false assumptions of uniformity on IP27
Date: Sun, 8 Oct 2006 00:25:20 +0100 [thread overview]
Message-ID: <20061007232520.GA23815@linux-mips.org> (raw)
In-Reply-To: <34353.136.163.203.3.1160138023.squirrel@www.ferretporn.se>
On Fri, Oct 06, 2006 at 02:33:43PM +0200, Karl-Johan Karlsson wrote:
> 1. What about the CPU feature test macros in
> include/asm-mips/cpu-features.h? They claim
> /*
> * SMP assumption: Options of CPU 0 are a superset of all processors.
> * This is true for all known MIPS systems.
> */
> but is that really true, even on a mixed R12k/R10k system?
To the degree that is actually matters, yes. For cache managment on
Origins the size of the S-cache doesn't matter, that is it is not
relevant if scache_size(cpu 0) > or < scache_size(cpu 1). It gets a
little hairy for stuff like performance counters where the R10000
supports a different set of events than its successors; that is not
something oprofile can deal with ...
Ralf
prev parent reply other threads:[~2006-10-07 23:25 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-06 12:33 /proc/cpuinfo makes false assumptions of uniformity on IP27 Karl-Johan Karlsson
2006-10-06 14:34 ` Ilya A. Volynets-Evenbakh
2006-10-07 23:25 ` Ralf Baechle [this message]
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